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采用高温结晶法处理硼矿石硫酸法制硼酸后的母液，进行硫酸镁和硼酸的分离。结晶实验在ＦＸＹ－０．５Ａ 高压釜中进行。在１８０℃温度下，ＭｇＳＯ４－Ｈ３ＢＯ３－Ｈ２Ｏ 体系结晶生成固相ＭｇＳＯ４·Ｈ２Ｏ。研究了硫酸镁浓度、硼酸浓度、结晶时间对ＭｇＳＯ４·Ｈ２Ｏ 结晶产率的影响，最后确定母液中ＭｇＳＯ４ 结晶生成固相ＭｇＳＯ４·Ｈ２Ｏ 的最佳工艺条件为：溶液中硫酸镁的浓度为２５％ —２８％ ，硼酸的浓度小于４％ ，结晶时间４ｈ，结晶温度１８０℃，一水硫酸镁产率为５７．６％ 。
High temperature crystallization method boric acid sulfuric acid boric acid after the mother liquor, magnesium sulfate and boric acid separation. Crystallization experiments were performed in a FXY-0.5A autoclave. At 180 ℃, MgSO4-H3BO3-H2O system crystallizes into solid MgSO4 · H2O. The effects of magnesium sulfate concentration, boric acid concentration and crystallization time on the crystallization yield of MgSO4 · H2O were studied. The optimum conditions for the crystallization of MgSO4 · H2O from the mother liquor were determined as follows: the concentration of magnesium sulfate in the solution was 25% 28%, the concentration of boric acid is less than 4%, the crystallization time is 4h, the crystallization temperature is 180 ℃ and the yield of magnesium sulfate monohydrate is 57.6%.